I don't think this means that it can't be genuine. I mean, the intent was to buy some good will with their customers who have experienced problems, that's for sure. But it's not a "bad" motive I think.
If I had a bad day and didn't get to complete something within my estimate, I'll tell my boss I had a bad day and ask for more time. Does that mean I have ulterior some ulterior motives? No, I just had a shit day, and needed some compassion.
They have been going through a rough patch recently with their scalability problems. And they realised they might not address it as easily or as quickly as they'd like. So they just wanted to buy time. I think that's better than "bunkering" and not letting your customers know what's up.
They do have the benefit that their audience is tech savvy as they are, so they can go into more details (and be less formal, I suppose) to get some understanding from their customers. As in, most devs have struggled at some point with a problem that exceeded the initial scope/time estimate. It sucks, and we know it sucks. So, why not give them the benefit of the doubt here?
Like, I think understand what you mean: their goal was to buy more time, and they achieved that. But even though it was corporate messaging, I still think it was genuine. I assume they felt a bit like "ok shit, we gotta talk to our customers, they deserve to know what's going on".
I guess they wouldn't air most their internal issue, since those don't aren't felt by the customers. So there's no need to apologise and explain themselves.